
a completely fresh clone seems ok. but that's a bit brutal
From: ghc-devs
From gitlab.haskell.org:ghc/ghc
! [new branch] wip/rae/remove-tc-dep -> origin/wip/rae/remove-tc-dep (unable to update local ref) error: cannot lock ref 'refs/remotes/origin/wip/rae/split-up-modules': 'refs/remotes/origin/wip/rae' exists; cannot create 'refs/remotes/origin/wip/rae/split-up-modules' ! [new branch] wip/rae/split-up-modules -> origin/wip/rae/split-up-modules (unable to update local ref) simonpj@MSRC-3645512:~/code/HEAD-2$